wait_for_resource_loaded: don't needlessly sleep for 5ms

We would needlessly time_wait_ms_nopoll(5) if opal_run_pollers()
managed to crank things enough to load the requested resource.

Instead of needlessly sleeping, check the result of resource_loaded()
*before* going to sleep for a bit.

Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

core/platform.c

@@ -205,9 +205,11 @@ int wait_for_resource_loaded(enum resource_id id, uint32_t idx)
 
 	while(r == OPAL_BUSY) {
 		opal_run_pollers();
+		r = resource_loaded(id, idx);
+		if (r != OPAL_BUSY)
+			break;
 		time_wait_ms_nopoll(5);
 		waited+=5;
-		r = resource_loaded(id, idx);
 	}
 
 	prlog(PR_TRACE, "PLATFORM: wait_for_resource_loaded %x/%x %u ms\n",